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#!/bin/bash
shopt -s extglob
m4_include(common)
write_source() {
local src=$1 spec= label= uuid= comment=()
label=$(lsblk -rno LABEL "$1" 2>/dev/null)
uuid=$(lsblk -rno UUID "$1" 2>/dev/null)
# bind mounts do not have a UUID!
case $bytag in
'')
[[ $uuid ]] && comment=("UUID=$uuid")
[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
;;
LABEL)
spec=$label
[[ $uuid ]] && comment=("$src" "UUID=$uuid")
;;
UUID)
spec=$uuid
comment=("$src")
[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
;;
*)
[[ $uuid ]] && comment=("$1" "UUID=$uuid")
[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
[[ $bytag ]] && spec=$(lsblk -rno "$bytag" "$1" 2>/dev/null)
;;
esac
[[ $comment ]] && printf '# %s\n' "${comment[*]}"
if [[ $spec ]]; then
printf '%-20s' "$bytag=$(mangle "$spec")"
else
printf '%-20s' "$(mangle "$src")"
fi
}
optstring_apply_quirks() {
local varname=$1 fstype=$2
# SELinux displays a 'seclabel' option in /proc/self/mountinfo. We can't know
# if the system we're generating the fstab for has any support for SELinux (as
# one might install Arch from a Fedora environment), so let's remove it.
optstring_remove_option "$varname" seclabel
case $fstype in
f2fs)
# These are Kconfig options for f2fs. Kernels supporting the options will
# only provide the negative versions of these (e.g. noacl), and vice versa
# for kernels without support.
optstring_remove_option "$varname" noacl,acl,nouser_xattr,user_xattr
;;
vfat)
# Before Linux v3.8, "cp" is prepended to the value of the codepage.
if optstring_get_option "$varname" codepage && [[ $codepage = cp* ]]; then
optstring_remove_option "$varname" codepage
optstring_append_option "$varname" "codepage=${codepage#cp}"
fi
;;
esac
}
usage() {
cat <<EOF
usage: ${0##*/} [options] root
Options:
-L Use labels for source identifiers (shortcut for -t LABEL)
-p Exclude pseudofs mounts (default behavior)
-P Include printing mounts
-t TAG Use TAG for source identifiers
-U Use UUIDs for source identifiers (shortcut for -t UUID)
-h Print this help message
genfstab generates output suitable for addition to an fstab file based on the
devices mounted under the mountpoint specified by the given root.
EOF
}
if [[ -z $1 || $1 = @(-h|--help) ]]; then
usage
exit $(( $# ? 0 : 1 ))
fi
while getopts ':LPpt:U' flag; do
case $flag in
L)
bytag=LABEL
;;
U)
bytag=UUID
;;
P)
pseudofs=1
;;
p)
pseudofs=0
;;
t)
bytag=${OPTARG^^}
;;
:)
die '%s: option requires an argument -- '\''%s'\' "${0##*/}" "$OPTARG"
;;
?)
die '%s: invalid option -- '\''%s'\' "${0##*/}" "$OPTARG"
;;
esac
done
shift $(( OPTIND - 1 ))
(( $# )) || die "No root directory specified"
root=$1; shift
if ! mountpoint -q "$root"; then
die "$root is not a mountpoint"
fi
# handle block devices
findmnt -Recvruno SOURCE,TARGET,FSTYPE,OPTIONS,FSROOT "$root" |
while read -r src target fstype opts fsroot; do
if (( !pseudofs )) && fstype_is_pseudofs "$fstype"; then
continue
fi
# default 5th and 6th columns
dump=0 pass=2
src=$(unmangle "$src")
target=$(unmangle "$target")
target=${target#$root}
if (( !foundroot )) && findmnt "$src" "$root" >/dev/null; then
# this is root. we can't possibly have more than one...
pass=1 foundroot=1
fi
# if there's no fsck tool available, then only pass=0 makes sense.
if ! fstype_has_fsck "$fstype"; then
pass=0
fi
if [[ $fsroot != / ]]; then
if [[ $fstype = btrfs ]]; then
opts+=,subvol=${fsroot#/}
else
# it's a bind mount
src=$(findmnt -funcevo TARGET "$src")$fsroot
if [[ $src -ef $target ]]; then
# hrmm, this is weird. we're probably looking at a file or directory
# that was bound into a chroot from the host machine. Ignore it,
# because this won't actually be a valid mount. Worst case, the user
# just re-adds it.
continue
fi
fstype=none
opts+=,bind
pass=0
fi
fi
# filesystem quirks
case $fstype in
fuseblk)
# well-behaved FUSE filesystems will report themselves as fuse.$fstype.
# this is probably NTFS-3g, but let's just make sure.
if ! newtype=$(lsblk -no FSTYPE "$src") || [[ -z $newtype ]]; then
# avoid blanking out fstype, leading to an invalid fstab
error 'Failed to derive real filesystem type for FUSE device on %s' "$target"
else
fstype=$newtype
fi
;;
esac
optstring_apply_quirks "opts" "$fstype"
# write one line
write_source "$src"
printf '\t%-10s' "/$(mangle "${target#/}")" "$fstype" "$opts"
printf '\t%s %s' "$dump" "$pass"
printf '\n\n'
done
# handle swaps devices
{
# ignore header
read
while read -r device type _ _ prio; do
options=defaults
if [[ $prio != -1 ]]; then
options+=,pri=$prio
fi
# skip files marked deleted by the kernel
[[ $device = *'\040(deleted)' ]] && continue
if [[ $type = file ]]; then
printf '%-20s' "$device"
elif [[ $device = /dev/dm-+([0-9]) ]]; then
# device mapper doesn't allow characters we need to worry
# about being mangled, and it does the escaping of dashes
# for us in sysfs.
write_source "$(dm_name_for_devnode "$device")"
else
write_source "$(unmangle "$device")"
fi
printf '\t%-10s\t%-10s\t%-10s\t0 0\n\n' 'none' 'swap' "$options"
done
} </proc/swaps
# vim: et ts=2 sw=2 ft=sh:
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